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V=40 cm^3= 0,04 dm^3
objętość metanu = V1
V* 80% = V1
V1 = 0,032 dm^3
Vo*n= V1
n=0,0015 mol - mole metanu
ze stechiometrii:
1 mol CH4 - 1 mol C
0,0015 - x
x=0,0015 mol
x=m/M
m=x* M = 0,0015 mol* 12 g/mol= 0,018 g